Elastoplastic damage model for quasi-brittle rocks based on continuum micromechanics—a review

摘要

This paper aims to take a review on the modeling of damage in quasi-brittle rocks based upon continuum micromechanics.The basic idea of continuum micromechanics is a representation of brittle porous rocks as a material with distributed microcracks.With a crack density parameter identified as the governing state variable for the description of damage,methods of continuum micromechanics,namely the Eshelby-based homogenization schemes,are used to obtain macroscopic quantities such as elastic stiffness tensor and stress and strain,respectively.A thermodynamics approach is finally employed to obtain a macroscopic elastoplactic damage model,in which the frictional dissipation on the lips of closed cracks and its coupling with damage can be treated.Overall,the approach is to substitute constitutive parameters,which have been defined a priori on macroscopic level,by micromechanically motivated parameters,which have more sound physical interpretations.Discussions on the future work related to micromechanics-based damage modeling are also carried out.